CN102106097A - Method for allocating PHICH and generating reference signal in system using single-user MIMO based on multiple codewords when transmitting uplink - Google Patents

Abstract

The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal.; The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponds to the reference signal configuration information.

Description

Many code words during based on the transmission up link are distributed PHICH and are generated the method for reference signal in the system that uses Single User MIMO

Technical field

The present invention relates to mobile communication technology and up link sending control method, more particularly, relate to based on the many code words when up link sends and in the system that uses single user's multiple-input and multiple-output (SU-MIMO), distribute the automatic repeat requests indicator channel of physical mixed (PHICH) and generate the method for reference signal.

Background technology

In mobile communication system, subscriber equipment (UE) can be in down link from the base station (BS) reception information and up link transmission information.The information that is sent or received by UE comprises data and various control information, and physical channel changes according to the information type that is sent or received by UE.

Fig. 1 illustrates and is used for (as the example of the mobile communication system) physical channel of the 3rd generation partner program (3GPP) Long Term Evolution (LTE) system and the figure that uses the universal signal sending method of this physical channel.

When the UE start or when UE newly enters the sub-district, this UE carries out in step S101 such as the search of initial zone operation synchronous with BS.In order to carry out this search of initial zone, UE can receive primary synchronization channel (P-SCH) and auxiliary synchronization channel (S-SCH) from BS, so as to carry out with BS synchronously, and obtain information such as sub-district ID.Afterwards, UE can receive Physical Broadcast Channel from BS, and obtains the broadcast message in this sub-district.In addition, UE can be in the search of initial zone step receiving downlink reference signal (DL RS) and confirm downlink channel status.

When finishing search of initial zone, UE can in step S102, receive physical downlink control channel (PDCCH) and with the corresponding physical down link sharing channel of this PDCCH (PDSCH), and obtain more detailed system information.

In addition, if UE does not finish the access to BS, then UE can carry out random access procedure in step S103 to S106, so that finish the access to BS.In order to carry out random access procedure, UE can send characteristic sequence (S103) as lead code via Physical Random Access Channel (PRACH), and can receive to the response message (S104) of random access procedure via PDCCH and with the corresponding PDSCH of this PDCCH.In access at random, except switching, can carry out the transmission (S105) that comprises additional PRACH and PDCCH and solve process with the competition of the reception (S106) of the corresponding PDSCH of this PDCCH based on competition.

After UE has carried out said process, as general uplink/downlink signal process of transmitting, this UE then can receive PDCCH/PDSCH (S107) and send that physical uplink link sharing channel (PUSCH)/physical uplink control channel (PUCCH) (S108).

Fig. 2 explains to realize that UE sends the figure of the signal processing of uplink signal.

In order to send this uplink signal, the scrambling module 210 of UE can utilize the scrambled signals of UE special use to come the signal that is sent is carried out scrambling.Signal through scrambling is transfused to modulation mapper 220, to utilize two-phase PSK (BPSK), Quadrature Phase Shift Keying (QPSK) or 16-quadrature amplitude modulation (QAM) to be modulated to composite symbol (complex symbol) by the signal of scrambling according to signal type that is sent and/or channel status.Afterwards, utilize 230 pairs of modulated composite symbols of conversion precoder to handle, and treated composite symbol is transfused to element of resource mapper 240.Element of resource mapper 240 can map to composite symbol the time-frequency resources key element that is used for actual transmission.Can the signal of above-mentioned processing be sent to BS via SC-FDMA signal generator 250 and antenna.

Fig. 3 explains to realize that BS sends the figure of the signal processing of down link signal.

In the 3GPPLTE system, BS can send one or more code word in down link.Therefore, similar with the up link transmission of Fig. 2, can handle with the structure composite symbol one or more code word by scrambling module 301 and modulation mapper 302.Afterwards, composite symbol tegillum mapper 303 maps to a plurality of layers, and each layer multiplies each other with the predetermined pre-coding matrix that precoding module 304 is selected according to channel status, and is assigned to each transmitting antenna.Treated signal via antenna transmission respectively is mapped as the time-frequency resources key element that is used to send by element of resource mapper 305, and can sends via OFDM maker 306 and antenna respectively.

In mobile communication system, send under the situation of signal in up link at UE, compare BS sends signal in down link situation, peak-to-average force ratio becomes problem more.Therefore, as above described with reference to Fig. 2 and Fig. 3, down link signal sends and uses the OFDMA scheme, and uplink signal sends the SC-FDMA scheme of using.

Fig. 4 explains to be used for uplink signal SC-FDMA scheme that sends and the OFDMA scheme that is used for the down link transmission in the mobile communication system.

The something in common that is used for uplink signal UE that sends and the BS that is used for the down link signal transmission is to comprise that serial-to-parallel transducer 401, subcarrier mapper 403, discrete inverse Fourier transform (IDFT) (or IFFT) module 404 of M point and Cyclic Prefix (CP) add module 406.

The UE that is used to utilize the SC-FDMA scheme to send signal also comprises parallel-to-serial converter 405 and N point DFT module 402.Adjacent input point in the input unit of 402 couples of IDFT of N point DFT module is carried out mapping, and partly offsets the influence of IDFT (or IFFT) processing of M point IDFT (or IFFT) module 404, makes the signal that is sent have single-carrier property.

In 3GPP LTE system, be used for sending the channel that uplink data sends affirmation (the ACK)/Negative Acknowledgement (NACK) of (physical uplink link sharing channel (PUSCH)) and be called as the automatic repeat requests indicator channel of physical mixed (PHICH) at down link.Fig. 5 is illustrated in the figure that sends the process of PHICH in the 3GPP LTE system.

Because the LTE system do not use SU-MIMO in up link, send the only ACK/NACK of 1 bit that the PUSCH that is used for a UE sends by PHICH, that is, and individual traffic or code word.To utilize code check be 1/3 repeated encoding is encoded to 3 bits (step 501) with the ACK/NACK of 1 bit, and utilizes two-phase PSK (BPSK) to generate three modulation symbols (step 502).Under the situation of normal Cyclic Prefix, utilize 4 to come modulation symbol is carried out spread spectrum, and under the situation of extended cyclic prefix, utilize 2 to come modulation symbol is carried out spread spectrum (step 503) as SF as spreading factor (SF).With regard to the multiplexing notion of inphase/orthogonal (I/Q), the orthogonal sequence number that is used for spread spectrum becomes SF*2.Therefore, the SF*2PHICH that uses the SF*2 orthogonal sequence to carry out spread spectrum is restricted to a PHICH group, and is arranged in a plurality of mapping of PHICH group tegillum (step 504), precodings, the resource mapping (step 505) of specific sub-frame, is sent out then.

Send in the down link PHICH channel resource method of the down link PHICH channel resource that distributes sub-district or BS or via node at the uplink data that is specific subscriber equipment or via node, utilize such computing to obtain the PHICH group index that is used to send in all PHICH group and the PHICH channel indexes of PHICH inside, promptly, minimum PRB index and cyclic shift value set that this computing will be used for one or more Physical Resource Block (PRB) that PUSCH sends are used for the resource of the rectification reference signal (DM-RS) of channel transmission, and utilize these index to distribute will to be sent to the PHICH channel of this specific UE or via node.The MIMO scheme can send and reception antenna side by side sends a plurality of data flow (or code word) in the space mode and significantly increases power system capacity by two or more that utilize BS and end, and can utilize a plurality of transmitting antennas to obtain to send diversity gain or beam shaping gains.In sending diversity scheme, owing to send same data message by a plurality of transmitting antennas, therefore can in fast-changing channel status, carry out data and send, and under the situation of the feedback information that is associated, can carry out the data transmission with channel with high reliability along with the time.Beam shaping is used to by corresponding suitably weight is applied to additive signal and the interference-to-noise ratio (SINR) that a plurality of transmitting antennas increase receiver.In general, in Frequency Division Duplexing (FDD) (FDD) system,, obtain the channel information that suitable beam shaping gain needs high reliability because up link and downlink channel are independently.Therefore, receiving independent feedback from receiver goes forward side by side and exercise to use.

Fig. 6 is the figure that spatial reuse (SM) and space division multiple access (SDMA) are shown.The SM that is used for single user is called as SM or SU-MIMO.Minimum value in the channel capacity of mimo system and the quantity of send/receive antenna increases pro rata.The SM that is used for the multi-user is called as space division multiple access (SDMA) or multiuser MIMO (MU-MIMO).

When using the MIMO scheme, there is single code word (SCW) scheme of using a channel coding blocks to send N data flow simultaneously and uses the individual channel coding blocks of M (M is less than or equal to N all the time) to send many code words (MCW) scheme of N data flow.Each channel coding blocks generates independently code word, and each code word designed to be used independently error-detecting.

Fig. 7 is the figure of structure that the transmitter of the mimo system that uses the MCW scheme is shown.Specifically, M data divide into groups to be encoded (for example, the turbo of Fig. 7 coding) and modulation (for example, the QAM of Fig. 7 modulation), and with M code word of generation, and each code word has independently HARQ processing block.M modulated data symbol is encoded in the MIMO level simultaneously according to many antenna scheme, and is sent out by corresponding physical antenna.Afterwards, receiver feedback multiple-antenna channel status is as channel quality information, with control SM lead, code check and modulation scheme.In this case, need additional control information.

Mapping relations between code word and the physical antenna have specific form.

Fig. 8 is the figure that the example of the mapping relations between code word and the physical antenna is shown.Specifically, Fig. 8 is illustrated in the mapping to layer of the code word that leads at SM in the down link (DL) of 3GPP TS 36.211.As shown in Figure 8, be 1 if SM leads (that is, order), then a code word is mapped to a layer, utilizes pre-coding scheme that the data of a layer are encoded, so that send by four transmitting antennas.If it is 2 that SM leads, then two code words are mapped to two layers, and are mapped to four antennas by precoder.

If it is 3 that SM leads, then in two code words is mapped to two-layerly by serial-to-parallel (S/P) transducer, and two code words are mapped to three layers, and are mapped to four antennas by precoder.If it is 4 that SM leads, then two code words are mapped to two layers by the S/P transducer, and whole four layers are mapped to four antennas by precoder.That is to say to have at BS under the situation of four transmitting antennas, can use maximum four layers, and can use four independently code words.Yet in Fig. 8, the code word number mostly is two most.Correspondingly, in system shown in Figure 8,, then can use maximum two HARQ processes independently if each code word CW has independently HARQ process.

Current, in the LTE system, suppose in PUSCH sends, to use single RF and power amplifier chain, owing to design the channel allocation of down link PHICH to PUSCH based on every UE 1 bit ACK/NACK, therefore consider the SU-MIMO in the PUSCH transmission, need to improve channel capacity and distribution method based on many code words.

Summary of the invention

Therefore, the present invention is devoted to distribute the automatic repeat requests indicator channel of physical mixed (PHICH) and generate the method for reference signal in the system that uses single user's multiple-input and multiple-output (SU-MIMO) based on the many code words when up link sends, and the present invention has eliminated substantially because the restriction of prior art and one or more problem that shortcoming is caused.

An object of the present invention is to provide the method for a kind of down link PHICH that when uplink data sends, sends control information, this control information is used for coming the using MIMO scheme based on the multiple access scheme except that single-carrier frequency division multiple access (SC-FDMA), and the method that is used to limit and represent the control information that under following state, sends, promptly, control information is comprised in and comprises by the sub-district, among the up link permission PDCCH of the transmission information of the via node appointment in base station or the down link, this control information is included as cyclic shift when up link sends and goes up a rectification reference signal (DM-RS) of dividing at each antenna (physical antenna or virtual-antenna) or transmission layer basis.

Additional advantages of the present invention, purpose and feature will partly obtain describing in the following description, and, to a certain extent, will become clearly, and perhaps can obtain understanding by practice of the present invention for the those of ordinary skills that read following content.Can realize and obtain purpose of the present invention and other advantages by the structure of specifically noting in written specification and claim and the accompanying drawing.

In order to realize these and other advantages, according to purpose of the present invention, as specifically implementing here and generalized description, a kind of in the method that is used in single user's multiple-input and multiple-output (SU-MIMO) system of one or more code word of up link transmission, generating the up link reference signal, described method comprises the steps: to send reference signal tectonic information by up link permission physical downlink control channel (PDCCH) to subscriber equipment at the place, base station, the structure of the reference signal that this reference signal tectonic information indication will send in up link, wherein, described subscriber equipment is set to according to operating with the corresponding up link access module of described information; And the subframe that comprises the reference signal that is generated based on described reference signal tectonic information from described subscriber equipment reception.Wherein, described reference signal tectonic information comprises the cyclic shift value of the sequence of described reference signal.

The reference signal tectonic information can comprise with whole M the reference signals that will in up link, send in the relevant information of cyclic shift of N reference signal, the offset information that wherein N≤M, and described information comprises the cyclic shift index of a reference signal that is used as standard in the described N reference signal and is used for determining the cyclic shift index of N-1 reference signal of residue.

Can determine numerical value M according to the transmission number of plies of the physics number of transmit antennas that disposes in the subscriber equipment, virtual transmit antennas number or subframe.

The reference signal tectonic information can comprise N in whole M the reference signals that will send (the cyclic shift index of individual reference signal of N≤M) in up link.

This N reference signal can be constant amplitude zero auto-correlation (CAZAC) reference signal.

N reference signal in this M reference signal is inserted into the predetermined symbol position of time domain, and carries out discrete Fourier transform (DFT) and handle.

N reference signal in this M reference signal mapped directly to the frequency that the input end with inverse discrete Fourier transform (IDFT) or inverse fast Fourier transform (IFFT) distributes and sent the corresponding sampled point of frequency band.

In the present invention on the other hand, a kind of in the method that is being used in single user's multiple-input and multiple-output (SU-MIMO) system of one or more code word of up link transmission, distributing the automatic repeat requests indicator channel of physical mixed (PHICH), the automatic repeat requests indicator channel of described physical mixed is used for sending the ack/nack (ACK/NACK) at each code word that is sent out, and this method comprises the steps: to determine the PHICH packet count; And utilize described PHICH packet count to determine PHICH packet index and the interior orthogonal sequence index of this PHICH grouping.Maximum code number of words when utilizing up link to send is determined the PHICH packet count.

Can utilize the function of unique deviant that each code word is provided to determine PHICH packet index and the interior orthogonal sequence index of this PHICH grouping.

Be understandable that, of the present invention above general describe and detailed description subsequently the two all be exemplary with indicative, and its purpose all is the further explanation that the invention provides for claim is protected.

Description of drawings

Accompanying drawing is included among the application providing further understanding of the present invention, and is attached among the application and constitutes the application's a part, and accompanying drawing has gone out embodiments of the present invention, and is used from specification one and explains principle of the present invention.In the accompanying drawing:

Fig. 1 illustrates to be used for as the physical channel of the 3rd generation partner program (3GPP) Long Term Evolution (LTE) system of the example of mobile communication system and the figure that uses the universal signal sending method of this physical channel;

Fig. 2 is the figure that interpreting user equipment (UE) sends the signal processing of uplink signal;

Fig. 3 explains that base station (BS) sends the figure of the signal processing of down link signal;

Fig. 4 explains the figure that is used for uplink signal SC-FDMA scheme that sends and the OFDMA scheme that is used for the down link signal transmission in the mobile communication system;

Fig. 5 is the figure that sends the process of PHICH in the 3GPPLTE system;

Fig. 6 is the figure that spatial reuse (SM) and space division multiple access (SDMA) are shown;

Fig. 7 is the figure of structure that the transmitter of the mimo system that uses the MCW scheme is shown;

Fig. 8 is the figure that a kind of example of the mapping relations between code word and the physical antenna is shown;

Fig. 9 illustrates DFT to handle the figure that output sample is mapped to the signal processing method of the single carrier among the SC-FDMA that clusters;

Figure 10 is the figure that illustrates according to the PHICH transmission of one embodiment of the present invention;

Figure 11 illustrates the block diagram that is applicable to UE and BS and can carries out the structure of device of the present invention.

Embodiment

Those skilled in the art hereinafter describe embodiments of the present invention with reference to the accompanying drawings in detail, so that can realize easily.Yet, can implement the present invention in every way, the invention is not restricted to execution mode described here.In the accompanying drawings, for the present invention clearly is described, will omit and the incoherent part of explanation of the present invention, and in whole specification, come part like the representation class with similar Reference numeral.

In whole specification, when the specific part specific components that " comprises (include) ", this does not also mean that and has got rid of other assembly, unless point out separately, otherwise can comprise other assembly.The term that uses in the specification " unit ", " device/part (or/er) " and " module " expression are used to handle at least a function that can be realized by hardware, software or their combination or the unit of operation.

In LTE-Advanced (LTE-A) system, (clustered) SC-FDMA that clusters (or DFT-s-OFDMA (DFT spread ofdma)) can be used as the up link multiple access scheme that is added into the SC-FDMA scheme and is applied to traditional SC-FDMA.Fig. 9 illustrates DFT to handle output sample is mapped to the signal processing method of single carrier in the SC-FDMA scheme that clusters figure.As shown in Figure 9, the difference of the SC-FDMA scheme that clusters and SC-FDMA scheme is that the N point sample of the output unit of N point DFT module is divided into and clusters (promptly, L sample group), and these sample groups mapped to M point IDFT (or IFFT) input unit respectively.For this reason, cubic measure of the signal that is sent out (CM) or peak-to-average power ratio (PAPR) increase, but remarkable cubic measure or peak-to-average power ratio less than the OFDMA scheme.In addition, the uplink scheduling flexibility increases, and the up link transfer rate increases.In the up link of LTE-A system, depend on and compare the space whether maximum transmit power exists transmitted power, specific subscriber equipment can utilize specific method to select the SC-FDMA scheme adaptively and in the SC-FDMA scheme any one of clustering, and sends thereby carry out up link.

Therefore, system of the present invention can support uplink multiple access scheme.Hereinafter, will come that present invention is described based on the hypothesis that the SC-FDMA scheme that clusters is used as the up link multiple access scheme that is applied to the SC-FDMA scheme.

Method and a kind of method of distributing on this channel from the PHICH index of uplink data channel of the ACK/NACK channel (Physical HARQ Indicator Channel (PHICH) hereinafter referred to as) that a kind of design sends in down link in SU-MIMO (the MCW SU-MIMO hereinafter referred to as) system based on the many code words of up link have been proposed in the present invention.In addition, proposed distributing PHICH and specifying the required up link of detailed delivery plan of MCW SU-MIMO scheme to permit the method that limits and represent control information on the PDCCH according to down link control information (DCI) form.

At first, in up link MCW SU-MIMO system, can consider to send at the method for the single ACK/NACK of many code words and in a plurality of code words each and send the method for ACK/NACK.The content of said method can change according to these two kinds of methods.Therefore, said method can be described respectively.

1. in up link MCW SU-MIMO, send the method for single ACK/NACK

Hereinafter, based on the vacation that in UL MCW SU-MIMO, sends single ACK/NACK

If will illustrate that HARQ handles the method for the MCS instruction content of indicating means, DM-RS cyclic shift index indicating means and n code word of structure.

Under specific uplink data transmission situation, if use MCW SU-MIMO, then according to utilize the individual code word of n (1≤n≤2 or 1≤n≤4) when sending, to start quantitatively and the corresponding HARQ processing of the quantity of code word based on the code word of every order to the mapping ruler of layer.Yet, for this reason, owing to the ACK/NACK of the n on the up link grant channel and HARQ handle indication or cause generating the new technical problem of traditional LTE standard from the increase that the HARQ that UE it seems handles quantity, forward compatibility between LTE system and the LTE-A system and the backward compatibility complexity that can become.

Figure 10 is the figure that illustrates according to the PHICH transmission of embodiment of the present invention.In order to address the above problem, the present invention proposes a kind of method, this method comprises the steps: to utilize MCW SU-MIMO to receive code word from specific UE; With every code word is that the basis utilizes CRC to carry out error-detecting; Using code word in interference eliminated (SIC) decoding continuously; And send one section ACK/NACK information of whole n code word by down link PHICH, so that maintain the quantity that the single ACK/NACK, the single HARQ on the up link permission PDCCH that realize in the LTE system and the traditional UE up link HARQ in sending handles.

Can utilize specific method to generate ACK/NACK information according to specific purposes.For example, when in whole n code words, detecting error, do not generate ACK, otherwise generate NACK.Therefore, with respect to whole n code word a HARQ being set handles.For this reason, the change handled in the operation of the PHICH channel design in the traditional LTE system, channel indexes distribution method and uplink HARQ is subjected to remarkable restriction.With execution mode that suggestion of the present invention is associated in, to each code word of being used to send (promptly, transmission block), if distributing to the quantity of the HARQ processing of particular UE in the specific carriers of system is 8, the method for the following UL SU-MIMO that has proposed the information of considering with respect to the content of the UL grant channel of specifying UL SU-MIMO to send and supported to be associated with this information.

(1) HARQ handles indication

This is the field of indication with respect to the single HARQ processing of n code word.Under the situation of MCW SU-MIMO, handle if carry out a HARQ with respect to n code word, then distribute in 0 to 7 the processing index.Even handle at HARQ and to be distributed to separately under the situation of each code word,, then calculate HARQ processing automatically at all the other n-1 code word based on fixing skew if specify at the HARQ index of determining the benchmark code word and represent with 3 bits.

In this case, as described herein, when one section ACK/NACK information is sent to UE in down link,, in the higher level buffering area of UE, can not generate empty phenomenon owing to ACK/NACK is distributed to each code word independently.Therefore, in MCW SU-MIMO, be provided with under the state greater than 1 order, do not consider that the sky of specific code word sends.Even when in the higher rank state of eNB (enode b), crossing (overriding) than low-rank (causing order is that 1 single code word sends), if handling, a HARQ is assigned to n code word, then owing to do not need to specify the indication of single code word, therefore can be owing to the distribution of 3 bits generation error.The term that uses among the present invention " is crossed (overriding) " and is meant sub-district, base station or via node and informs that UE will use the order value of indication uplink channel state when utilizing MCWSU-MIMO to send PUSCH.If use an ACK/NACK and distributed single HARQ to handle, then will indicate the additional bit of code word to be added into the HARQ processing indication field of 3 bits or can be defined as independent explicit code word indication field with respect to n code word.Relevant with the HARQ processing, can permit PDCCH to send new data indicator (NDI) with up link with aspect.Handling even define and sent a HARQ with aspect, can be that the basis is provided with this NDI separately with every code word also.In some cases, handle, be defined and sent with aspect so a NDI can be used as up link permission PDCCH owing to defined a HARQ.

(2) method of indication cyclic shift index rectification-reference signal (DM-RS)

The method of the cyclic shift index of the DM-RS on the indication uplink channel will be divided into following three kinds of situations.

1) first kind of situation

In first kind of situation, when realizing traditional UL SU-MIMO, need RS that letter is provided

The road estimates that (p≤m) individual receiving data stream carries out demodulation to p to construct according to transmission (Tx) antenna/layer of UE, the transmission of UE (Tx) antenna/layer structure limited by the m (for example, m can be 2 or 4,1 or 2 or 3 or 4) of expression transmitting antenna (virtual-antenna or physical antenna) number or the virtual-antenna number or the transmission number of plies.At this moment, the q among P RS (the individual RS of q≤p) be designated as the cyclic shift version of the sequence that the computer based on QPSK of the low correlated characteristic under the 1RB/2RB situation generates or have the CAZAC basic sequence of the length in the zone that the data on the frequency carrier that is used for specific OFDM, SC-FDMA or clusters the SC-FDMA symbol send (at RS send can specify OFDM, a SC-FDMA or cluster the SC-FDMA symbol or specify a plurality of OFDM, SC-FDMA or the SC-FDMA symbol that clusters as TDM).

RS index as the standard of indicating q cyclic shift index that has used can be 3 bit lengths.Owing to utilize and to utilize any regular to come the skew of appointment changeably, fixing skew or fixing selective rule to specify remaining q-1 cyclic shift index automatically, so can when UE sends employed cyclic shift index with aspect, make the expense minimum according to system environments.

2) second kind of situation

In second kind of situation, described in first kind of situation, can specify and be used as, and utilize the information specific reduced rule that the individual bit of 3+ α (0＜α＜3* (q-1)) be appointed as in the cyclic shift index of q RS with the combination of aspect transmission at the cyclic shift of residue q-1 different RS of the cyclic shift index of the RS of the standard of the cyclic shift index of q RS.For example, α can be defined as representative at the index of RS and at as all or part of q-1 RS sequence of the value (less than the numerical value of 3 bits) of the difference between the cyclic shift index of the RS of standard and bit value.

3) the third situation

In the third situation, described in first kind of situation, can on the UL grant channel, spell out cyclic shift with respect to q RS at q RS.In this case, if the bit size of single cycle shift field is 3 bits, then the size of the RS cyclic shift field in the control information payload of UL channel is 3*q.

If p is identical with q under first kind of situation, then the RS of the CAZAC sequence of the frequency ranges of data among one or more OFDM, SC-FDMA or the SC-FDMA that clusters is used as whole RS of whole antennas.In the present invention, suppose that antenna comprises virtual-antenna, physical antenna and transmission layer.

If p is different with q under first kind of situation, make the cyclic shift number of the CAZAC RS sequence quadrature that sends by specific OFDM, SC-FDMA or the SC-FDMA symbol that clusters as being provided, cyclic shift at p RS is not enough to realize OFDM, a SC-FDMA or the SC-FDMA allocation of symbols that clusters are given under the state of each time slot, be used for sending OFDM, the SC-FDMA of a plurality of RS sequences or the SC-FDMA symbol that clusters distributes according to first kind of situation, and can the additional CAZAC RS sequence of continuous dispensing.Yet,, utilize distinct methods heterogeneous RS generation, that have low expense so use with q CAZAC RS because this allocative decision directly makes the UL throughput degradation.The quantity of heterogeneous RS is set to p-q, and the value of p-q gained is equal to or greater than 0.At this moment, for whole expense adjustment, q can be 0.

As with the execution mode of the design of traditional TDM (OFDM, SC-FDMA or the SC-FDMA symbol that clusters)-RS that CDM (CAZAC) sequence is different, under the situation of using the SC-FDMA or the SC-FDMA that clusters, can consider RS to be inserted the scheme of the individual predetermined time-domain symbol position of the time sample zone that sends arbitrarily in the symbol or r (r 〉=1) in next stage of the previous stage of DFT or IDFT (or IFFT).

The RS that is inserted into time domain in the previous stage of DFT carries out the frequency spectrum spread spectrum by DFT, by whole subcarriers of the frequency domain of spread spectrum to the DFT zone, and carry out IFFT, be sent to receiver by channel, and in this receiver, carry out FFT and IFFT, thereby extract the channel information of the antenna on the frequency band that is used to send data from r RS of character position.

Can use and the RS sequence mapped directly to frequency domain and need not to carry out DFT with the scheme of carrying out IFFT and be used for the RS sequence being mapped directly to OFDM, SC-FDMA or the scheme of the SC-FDMA symbol area that clusters in the next stage of IFFT at the RS sequence of being shone upon.OFDM, SC-FDMA or the SC-FDMA symbol area that clusters can be the part-time sampling zones of whole OFDM, SC-FDMA or cluster SC-FDMA symbol area or OFDM, SC-FDMA or the SC-FDMA symbol area that clusters.Be inserted under OFDM, SC-FDMA that is used to send data or the situation that clusters the SC-FDMA symbol at RS, can specify OFDM, SC-FDMA or the SC-FDMA symbol that clusters in the fixed position, and RS can be inserted into this fixed position or RS and can be inserted into the position that is generated by Resource Block index and/or sub-district ID according to ad hoc rules.Under the situation of the expense of having added additional RS, it seems that from data and multiplexing visual angle the punching that is used for sending the symbol of data or rate-matched can be guaranteed the resource that RS will be mapped.

UL RS design is not only applicable to UL SU-MIMO scheme and also is applicable to the non-space multiplexing scheme.Under the situation of DM-RS, existing DM-RS to send under the situation of OFDM, SC-FDMA or the SC-FDMA symbol that clusters, can in different OFDM, SC-FDMA or the SC-FDMA symbol that clusters, limit the UL-RS design extraly based on traditional TDM-CDM design.Alternatively, the UL-RS design can be used for replacing specifying based on DM-RS transmission OFDM, the SC-FDMA of traditional TDM-CDM design or the scheme of the SC-FDMA symbol that clusters.UL RS design is not only applicable to DM-RS and also is applicable to SRS.

If OFDM, SC-FDMA or the SC-FDMA symbol that clusters are applied to UL and send, then can limit the pattern that RS is inserted into the fixed frequency carrier position in the Resource Block in the Resource Block unit.This pattern can be limited in the mode that is exclusively used in the sub-district by specific function or the rule of utilizing sub-district ID as input signal.This Resource Block comprise virtual resource blocks and Physical Resource Block the two.Therefore, insert RS in the time of can before the IFFT of transmitter input, carrying out sign map.If being inserted into, RS is used for sending one or more OFDM, the SC-FDMA of data or the SC-FDMA symbol that clusters, then the RS position that can be inserted into the fixed position or generate by Resource Block index and/or sub-district ID according to ad hoc rules.At this moment, can utilize the punching that is used for sending data or carries out the symbol of rate-matched to guarantee the resource that RS will be mapped.

In specific system, for p-q RS among p the RS, use with traditional environment based on the different RS delivery plan of the CAZAC RS delivery plan of TDM in, for specific purpose, can consider based on each transmitting antenna or send the scheme of transmission RS of layer or the scheme of allocation index.Tx antenna/layer structure can change according to UE.For example, under the situation of 2 Tx antenna configurations or 2 layers of transmission, can be basic given antenna port index or layer port index #i and # (i+1) (i 〉=0) with each transmitting antenna or transmission layer.As another example, under the situation of 4 Tx antenna configurations or 4 layers of transmission, can be basic given antenna port index or layer port index #i, # (i+1), # (i+2) and # (i+3) with each transmitting antenna or transmission layer.At this moment, a kind of scheme has been proposed, this scheme will be applied to based on the CAZAC RS of TDM from hanging down q the antenna port that the antenna port index begins in the ascending order mode with excellent relatively channel estimating performance, utilize and said method diverse ways formation sequence, and the RS that will map to physical resource is applied to remaining antenna port.

Except the content of UL grant channel,, should serve as that the basis generates and use SRS with each antenna port or layer port according to UL Tx antenna/layer structure even in the SRS design.At this moment, for the multiplexing capacity of expansion is provided, can and limit transmission cycle of the SRS of each antenna port in the time domain adjustment.In one embodiment of the invention, in the sequences Design environment identical, identical multiplexing capacity is provided to the condition of p transmitting antenna or transmission layer with the SRS of individual antenna, the transmission cycle of the SRS of the time domain of particular UE equates, and the method that can use each antenna or layer order according to UE to send SRS.Alternatively or side by side, can design the SRS sign indicating number of the capacity that is used to provide expansion with the frequency domain distribution search plan explicitly, to support the multiplexing capacity of CDM/FDM efficiently.Specifically, consider cyclic shift u that application code sequence level not only can be used also the sequence under the state of application sequence rank scrambling low associated root index v partly or entirely, a sign indicating number sequence resource can increase v doubly.At this moment, the part of low associated root index can be indicated and (if UL DM-RS is grouped) the interior corresponding index of basic sequence that divide into groups.Low relevant root index is sent to UE by L1/L2 control signaling or higher level RRC signaling.

If utilize the distribution search plan to be mapped in the constant offset interval, then can adjust the search deviant according to channel condition, SRS transmission load or required time of channel detection as the subcarrier of the mapped physical resource of sequence key element.Alternatively or side by side, for the whole system bandwidth of having shone upon SU-MIMO (for example, 20MHz) (for example specify limited frequency band of detection, 5MHz), in this limited frequency band, carry out and survey and packet scheduling, and division and use are at the virtual subnet band system band of a plurality of UL SU-MIMO schemes, thereby the multiplexing capacity in the support frequency domain.The deviant of distribution search plan or frequency band of detection are sent to UE by L1 (ground floor)/L2 (second layer) control signaling or higher level RRC signaling.

(3) structure of the MCS instruction content of n code word

Can use following three kinds of methods, promptly distribute s bit in the state of specifying single HARQ to handle for n code word, to use a MCS and to send the method for this MCS from the base station to UE, consider the error-detecting ability of n code word, the channel estimation ability of each antenna and optimum pre-coding matrix indication (PMI) computing mode that receives the base station are distributed s*n bit and can be sent the method for each code word MCS by the UL grant channel under the situation that need not to compress, and by to s bit of the MCS value of representing the benchmark code word and represent s in the remaining n-1 code word and the individual bit of (s-δ) * (n-1) of the difference between the δ is sued for peace and distributed the method for the individual bit of whole s+ (s-δ) * (n-1).Selection specifies the method for MCS to have nothing to do with selecting HARQ processing indicating means according to code word.That is to say that during single HARQ handled, single ACK/NACK information feedback method was applied to MCW SU-MIMO and sends, and is used for specifying the control information of MCS to be sent to UE by UL permission PDCCH with aspect according to code word.

Up to now, illustrated HARQ handle indicating means, indication DM-RS cyclic shift method and based on the method for the MCS of the hypothesis indication code word that sends single ACK/NACK in the UL MCW SU-MIMO.

To illustrate hereinafter that in UL MCW SU-MIMO the method that sends a plurality of ACK/NACK will illustrate that then PHICH resource allocation methods, HARQ handle the method for cyclic shift of indicating means, indication DM-RS and the method for indicating the MCS of code word when a plurality of ACK/NACK of transmission.

2. utilize UL MCW SU-MIMO to send the method for a plurality of ACK/NACK

In specific UL data send, if use MCW SU-MIMO, then according to utilize the individual code word of n (1≤n≤2 or 1≤n≤4) when sending, under the variable effect of traditional LTE system, can start quantitatively and the corresponding HARQ processing of the quantity of code word based on the code word of every order to the mapping ruler of layer.That is to say, can serve as that the basis limits the transmission of DL ACK/NACK information at sending with each code word.Below, the present invention proposes a kind of method, this method utilizes MCS SU-MIMO to receive code word from specific UE, carry out error-detecting, utilizing code word when interference eliminated (SIC) is decoded continuously serves as that CRC is used on the basis with every code word, and sends independent ACK/NACK information at whole n code word by down link PHICH.

(1) PHICH resource allocation methods

PHICH packet count in not having the traditional LTE system of MCW SU-MIMO on down link PHICH appointment, that send at UL need be determined based on following hypothesis, that is, suppose that being applied in the state of LTE-A system with each code word extraly at MCW SU-MIMO is basis pointer ACK/NACK that UL is sent individually.That is to say, when the amount of the ACK/NACK information that will be in down link sends from sub-district, base station or the via node of determining must increase owing to introduce UL MCW SU-MIMO and the maximum of PHICH packet count required PHICH resource based on the UL system bandwidth is set to when constant, because MCWSU-MIMO is newly introduced the UE of LTE-A system, therefore must the PHICH packet count be set based on the PHICH stock number of the PHICH resource twice that is equal to or less than the LTE system.

First three OFDM symbol individual or still less by each subframe sends physical downlink control channel (PDCCH), and the OFDM symbolic number can be adjusted to 1 to 3 according to the downlink control channel expense.The channel that is used for adjusting at the PDCCH of each subframe the OFDM symbolic number is physical control format indicator channel (PCFICH), and the channel that is used to send at ack/nack (ACK/NACK) information of UL data channel is a physical mixed ARQ indicator channel (PHICH).In addition, be used to send that down link data sends or the control channel of the control information that the UL data send is physical downlink control channel (PDCCH).

PHICH sends the ACK/NACK at the UL data channel.A plurality of PHICH groupings are comprised in the subframe, and a PHICH grouping comprises a plurality of PHICH.Correspondingly, the PHICH of a plurality of UE is comprised in the PHICH grouping.The frequency cyclic shift of the DM-RS that utilizes the minimum PRB index of PUSCH resource allocation and send by the UL enabling signal is carried out the distribution to UE with the PHICH in a plurality of PHICH groupings.The PHICH channel resource is that index is right

Here,

In

Expression PHICH packet index, and

Orthogonal sequence index in the expression PHICH grouping.

Can utilize more only the PHICH grouping of the PHICH number that limits in the traditional LTE system (that is, based on) in the increase number of the PHICH grouping that the UL of the UE of traditional LTE system limits in sending to distribute the PHICH resource.Distribute the PHICH resource and support the method for backward compatibility, the numerical value of N of Radio Resource control (RRC) parameter of cell-specific as UE from the angle of PDCCH resource mapping to traditional LTE system _gAlways be set to larger than desirable value, and based on set N _gDL PHICH resource in the PHICH grouping that value is calculated is assigned to the UE of LTE-A system.Carrying out PHICH based on the minimum principle of conflicting with the UE that PHICH is dispensed to traditional LTE system distributes.Proposed to calculate the numerous embodiments of the method for PHICH packet count.

1) first method of calculating DL PHICH packet count

Can utilize formula 1 to calculate the DLPHICH packet count.

Formula 1

In formula 1, can provide N by the higher level signaling _g∈ 1/6,1/2,1,2}, N _gCan convergent-divergent PHICH packet count make the PHICH packet count different in DL and UL band system band.That is to say N _gBe used for adjusting the PHICH number according to current environment.In formula 1,

Available Resource Block quantity in the expression DL band system band, and N _cBe illustrated in carry out in sub-district, base station or the system UL send during maximum code word number (that is encoding block number).

2) second method of calculating DL PHICH packet count

Need not the N in the use formula _cAs new argument, can utilize formula 2 to limit and represent to expand the N that provides by traditional higher level signaling _gThe bit size of the L1 parameter that the scope of value also will be associated with this scope is that 3 bits are to calculate the equatioies of DLPHICH packet count from 2 bit expanded.

Formula 2

In formula 2, N _gScope can be restricted to N _g∈ 1/6,1/3,1/2,1,2,4}, N _g∈ 1/6,1/3,1/2,1,2,3,4} and N _g∈ 1/6,1/4,1/3,1/2,1,2,3, among the 4} one.Consider N with the UE of traditional LTE system _gThe backwards compatibility of value can newly limit the N of UE that the LTE-A system of UL SU-MIMO or carrier aggregation has been used in representative _gThe RRC parameter of a series of cell-specific of value, thus with the N of the UE of the traditional LTE of representative system _gThe RRC parameter of the cell-specific of value is distinguished mutually.

3) the 3rd method of calculating DL PHICH packet count

Replace

Can utilize formula 3 to limit and represent to utilize as Resource Block quantity available in the UL band system band

Calculate the equation of DL PHICH packet count.

Formula 3

In formula 3, can provide N by the higher level signaling _g∈ 1/6,1/2,1,2}, N _gCan convergent-divergent PHICH packet count make this PHICH packet count different in DL and UL band system band.That is to say N _gBe used for adjusting the PHICH number according to current environment.In formula 1,

Available Resource Block quantity in the expression DL band system band, and N _cBe illustrated in carry out in sub-district, base station or the system UL send during maximum code word number (that is encoding block number).

In the method that limits the PHICH packet count, even in the LTE system, N _cCan be set to 1, N _gScope can be restricted to N _g{ 1/6,1/2,1,2} perhaps can limit N with respect to multiple situation to ∈ _gScope or with N _gScope be defined as constant 1.

4) the 4th kind of method of calculating DL PHICH packet count

Replace

Use is as number of resource blocks available in the UL band system band Need not the N in the use formula _cAs new argument, can utilize formula 4 to limit and represent to expand the N that provides by traditional higher level signaling _gThe value scope and will with N _gThe bit size of the L1 parameter that value is associated is that 3 bits are to calculate the equation of DLPHICH packet count from 2 bit expanded.

Formula 4

In formula 4, N _gScope can be restricted to N _g∈ 1/6,1/3,1/2,1,2,4}, N _g∈ 1/6,1/3,1/2,1,2,3,4} and N _g∈ 1/6,1/4,1/3,1/2,1,2,3, among the 4} one.In addition, N _gScope can limit and can be restricted to N with respect to multiple situation _g∈ 1,2}, N _g∈ 1,2,4}, N _g∈ 1/2,1,2,4} or constant 1.In the 4th kind of method calculating the PHICH packet count, utilize parameter The method of calculating the PHICH packet count is applicable to utilization

Replace

Calculate the equation of the first method and the second method of PHICH packet count.

Consider the backwards compatibility with the UE of traditional LTE system, can newly limit the N of UE that the LTE-A system of ULSU-MIMO or carrier aggregation has been used in representative _gThe RRC parameter of a series of cell-specific of value, with the N of the UE of the traditional LTE of representative system _gThe RRC parameter of the cell-specific of value is distinguished mutually.

Before the resource grouping alignment of explanation based on the independent PHIICH grouping of PHICH packet count, layer mapping and pre-coding scheme, for the UE that supports the LTE system and have LTE-A and backwards compatibility and the forward compatibility of the UE of the LTE-A system of LTE network, even in the DL of LTE-A system number of transmit antennas is 8 state, also can sends diversity schemes and send DL PDCCH, PCFICH and PHICH based on four transmitting antenna utilizations.

In addition, even in using the state of 8 transmitting antennas, also can be used for amount and position that the amount of sub-carrier resources of the frequency domain that the DL RS of an OFDM symbol and the 2nd OFDM symbol sends and position are set to equal the sub-carrier resources in the traditional LTE system.Therefore, although the resource grouping of PDCCH, PCFICH and PHICH is alignd, layer shines upon and pre-coding scheme according to keeping with the similar mode of LTE scheme, also support compatible.

Based on the PHICH packet count that the method that proposes by the present invention is obtained, can utilize index at the PHICH grouping

With divide into groups owing to this PHICH interior spreading code and the multiplexing orthogonal sequence index that generates of I-Q

Right

Represent resource grouping alignment, layer mapping and pre-coding scheme, PHICH resource allocation at the UL transmission of independent UE.

Coming in specific UE, to carry out in the state of PHICH resource allocation according to single code word or code word grouping by the UL SU-MIMO that introduces based on many code words, for specific codewords indexes i (i=1 ..., n wherein n (=1 ..., )) can utilize

Represent that the PHICH resource is right.At this moment, i represents to be used for the code word number that ULSU-MIMO sends, and

The predetermined maximum quantity of the PHICH channel among the expression UL SU-MIMO. Can equal the packet count of code word available among the maximum quantity of code word available among the UL SU-MIMO or the UL SU-MIMO.

Utilization is used for the PHICH packet index that the cyclic shift index of the UL DM-RS that UL sends and minimum index value that Physical Resource Block distributes are determined the present invention's proposition

With PHICH orthogonal sequence index

At this moment, the cyclic shift index of UL DM-RS is used as different PHICH resource allocations to the parameter of having used PHICH required among the UL SU-MIMO of many code words.If not carrying out ULPUSCH by UL permission PDCCH sends, then the cyclic shift index of ULDM-RS can be predetermined value (for example, index #0) or when the RRC parameter signalling by UE or via node or L1/L2PDCCH signaling start when sending reply the cyclic shift index that can specify UL DM-RS by UE or via node.

Being used for the antenna port number that UL SU-MIMO sends in specific UE can be P, and it is N that the code word of using in SU-MIMO is counted maximum, and can limit individual antenna port index p (p=1 ..., P-1).In ULSU-MIMO, be whole P the index that the RS sequence that the cyclic shift of utilizing UL DM-RS and/or other method generate is distributed on the basis with each antenna port.If P is identical with n, then single RS sequence index can be as deriving

With

The DM-RS sequence index of every n the code word of using in the process of value (perhaps cyclic shift index).On the contrary, if P greater than n, then must select to be used as in the RS sequence index

The index of value.

As system of selection, can use according to ascending order from P RS sequence index, select n index method, (for example select n RS sequence index according to ascending order every RS sequence index, first, the 3rd, the 5th index) method, perhaps utilize based on the rule of specific function and select the method for index, select the method for index at random, perhaps according to the method for the selective sequential index of first index, last index, second index, penult index.In addition, if utilize the method that generates the method for DM-RS sequence or utilize other method to generate the DM-RS sequence by CAZAC or ZC method to generate P DM-RS sequence, then can utilize arbitrary method of the present invention to select n index from utilizing to generate the cyclic shift index of method generation of DM-RS sequence by CAZAC or ZC method.

Can utilize said method based on single codewords indexes i's Obtain

With

Value.Alternatively, except codewords indexes i's

Can also utilize specific function f (i) to adjust or derive

With Value, make and the minimum of conflicting of the PHICH channel resource allocation of the UE of traditional LTE system.At the value i of higher level configuration function f (i), and can be by the next value i that sends function f (i) to the UE of LTE-A system with aspect of the RRC signaling of a series of UE special use.Hereinafter propose to calculate the PHICH packet index

With PHICH orthogonal sequence index

The whole bag of tricks.

1) first method

Can calculate the PHICH packet index by through type 5 With PHICH orthogonal sequence index

Formula 5

$n_{\mathrm{PHICH}}^{\mathrm{group}}\left(i\right)=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{RS}}^{\mathrm{seq}}\left(i\right))\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The size of the spreading factor (SF) that uses in the expression PHICH modulation, and

The minimum index of the Physical Resource Block (PRB) of expression UL resource allocation.

Expression is by the PHICH packet count of higher level configuration.

2) second method can be calculated the PHICH packet index by through type 6

With PHICH orthogonal sequence index

Formula 6

$n_{\mathrm{PHICH}}^{\mathrm{group}}\left(i\right)=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{RS}}^{\mathrm{seq}}\left(i\right)+f\left(i\right))\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The size of the spreading factor (SF) that uses in the expression PHICH modulation, and The minimum index of the Physical Resource Block (PRB) of expression UL resource allocation.

Expression is by the PHICH packet count of higher level configuration.In addition, f (i) expression is used to provide the function of unique code word offset, and can be function f (i)=i or be the constant that the basis sets in advance with every codewords indexes.

3) the third method

Can calculate the PHICH packet index by through type 7 With PHICH orthogonal sequence index

Formula 7

$n_{\mathrm{PHICH}}^{\mathrm{group}}\left(i\right)=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{RS}}^{\mathrm{seq}}\left(i\right)+f\left(i\right))\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The size of the spreading factor (SF) that uses in the expression PHICH modulation, and

The minimum index of the Physical Resource Block (PRB) of expression UL resource allocation.

Expression is by the PHICH packet count of higher level configuration.In addition, f (i)=α i represents to be used to provide the function of unique code word offset, and α can be the non-zero constant that is provided by the higher level signaling.

4) the 4th kind of method

Can calculate the PHICH packet index by through type 8

With PHICH orthogonal sequence index

Formula 8

$n_{\mathrm{PHICH}}^{\mathrm{group}}\left(i\right)=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{RS}}^{\mathrm{seq}}\left(i\right)\·f\left(i\right))\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The size of the spreading factor (SF) that uses in the expression PHICH modulation, and

The minimum index of the Physical Resource Block (PRB) of expression UL resource allocation.

Expression is by the PHICH packet count of higher level configuration.In addition, f (i) expression is used to provide the function of unique code word offset, and can be function f (i)=i or be the non-zero constant that the basis sets in advance with every codewords indexes.

5) the 5th kind of method

Can calculate the PHICH packet index by through type 9 With PHICH orthogonal sequence index

Formula 9

$n_{\mathrm{PHICH}}^{\mathrm{group}}\left(i\right)=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{RS}}^{\mathrm{seq}}\left(i\right)\·f\left(i\right))\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The size of the spreading factor (SF) that uses in the expression PHICH modulation, and

The minimum index of the Physical Resource Block (PRB) of expression UL resource allocation.

Expression is by the PHICH packet count of higher level configuration.In addition, f (i)=α i+1 or f (i)=α (i+1) expression is used to provide the function of unique code word offset, and α can be the non-zero constant that is provided by the higher level signaling.

Can use above-mentioned obtaining explicitly with any one method in the several different methods of above-mentioned qualification PHICH packet count

With

The several different methods of value in any one method.Calculate the method for PHICH packet count and the PHICH distribution method relevant and be not limited to UL SU-MIMO, and go for because the LTE-A Technology Need of introducing such as UL carrier aggregation or UL coordination multiple spot (CoMP) carries out the whole circumstances that a plurality of PHICH distribute to particular UE with these computational methods.

Up to now, the PHICH resource allocation has been described.Hereinafter will illustrate that HARQ handles the method for the MCS instruction content of indicating means, DM-RS cyclic shift index indicating means and n code word of structure based on the hypothesis of utilizing UL MCW SU-MIMO to send a plurality of ACK/NACK.

(1) HARQ handles indication

The field that these single or a plurality of HARQ that are indication is carried out for n code word handle.Even under the situation of a code word being distributed HARQ handle separately,, then calculate the HARQ processing of all the other n-1 code word automatically based on fixing skew if specify the HARQ index of special datum code word also to represent with 3 bits.Other bit of indication code word may be added to 3 bit HARQ and handles indication field or be restricted to independent explicit code word indication field.

(2) method of indication cyclic shift index rectification-reference signal (DM-RS)

The method of the cyclic shift index of the DM-RS on the indication UL channel will be divided into following three kinds of situations.

1) first kind of situation

In first kind of situation, when realizing traditional UL SU-MIMO, (p≤m) individual receiving data stream carries out demodulation to p to construct according to transmission (Tx) antenna/layer of UE to need RS that channel estimating is provided, the transmission of UE (Tx) antenna/layer structure limited by the m (for example, m can be 2 or 4,1 or 2 or 3 or 4) of expression transmitting antenna (virtual-antenna or physical antenna) number or the virtual-antenna number or the transmission number of plies.At this moment, the q among P RS (the individual RS of q≤p) be designated as the cyclic shift version of the sequence that the computer based on QPSK of the low correlated characteristic under the 1RB/2RB situation generates or have the CAZAC basic sequence of the length in the zone that the data on the frequency carrier that is used for specific OFDM, SC-FDMA or clusters the SC-FDMA symbol send (at RS send can specify OFDM, a SC-FDMA or cluster the SC-FDMA symbol or specify a plurality of OFDM, SC-FDMA or the SC-FDMA symbol that clusters as TDM).

RS index as the standard of indicating q cyclic shift index that has used can be 3 bit lengths.Owing to utilize and to utilize any regular to come the skew of appointment changeably, fixing skew or fixing selective rule to specify remaining q-1 cyclic shift index automatically, so can when UE sends employed cyclic shift index with aspect, make the expense minimum according to system environments.

2) second kind of situation

In second kind of situation, described in first kind of situation, can specify and be used as, and utilize the information specific reduced rule that the individual bit of 3+ α (0＜α＜3* (q-1)) be appointed as in the cyclic shift index of q RS with the combination of aspect transmission at the cyclic shift of residue q-1 different RS of the cyclic shift index of the RS of the standard of the cyclic shift index of q RS.For example, α can be defined as representative at the index of RS and at as all or part of q-1 RS sequence of the value (less than the numerical value of 3 bits) of the difference between the cyclic shift index of the RS of standard and bit value.

3) the third situation

In the third situation, described in first kind of situation, can on the UL grant channel, spell out cyclic shift with respect to q RS at q RS.In this case, if the bit size of single cycle shift field is 3 bits, then the size of the RS cyclic shift field in the control information payload of UL channel is 3*q.

If p is identical with q under first kind of situation, then the RS of the CAZAC sequence of the frequency ranges of data among one or more OFDM, SC-FDMA or the SC-FDMA that clusters is used as whole RS of whole antennas.In the present invention, suppose that antenna comprises virtual-antenna, physical antenna and transmission layer.

If p is different with q under first kind of situation, make the cyclic shift number of the CAZAC RS sequence quadrature that sends by specific OFDM, SC-FDMA or the SC-FDMA symbol that clusters as being provided, cyclic shift at p RS is not enough to realize OFDM, a SC-FDMA or the SC-FDMA allocation of symbols that clusters are given under the state of each time slot, be used for sending OFDM, the SC-FDMA of a plurality of RS sequences or the SC-FDMA symbol that clusters distributes according to first kind of situation, and can the additional CAZAC RS sequence of continuous dispensing.Yet,, utilize distinct methods heterogeneous RS generation, that have low expense so use with q CAZAC RS because this allocative decision directly makes the UL throughput degradation.The quantity of heterogeneous RS is set to p-q, and the value of p-q gained is equal to or greater than 0.At this moment, for whole expense adjustment, q can be 0.

As with the execution mode of the design of traditional TDM (OFDM, SC-FDMA or the SC-FDMA symbol that clusters)-RS that CDM (CAZAC) sequence is different, under the situation of using the SC-FDMA or the SC-FDMA that clusters, can consider RS to be inserted the scheme of the individual predetermined time-domain symbol position of the time sample zone that sends arbitrarily in the symbol or r (r 〉=1) in next stage of the previous stage of DFT or IDFT (or IFFT).

The RS that is inserted into time domain in the previous stage of DFT carries out the frequency spectrum spread spectrum by DFT, by whole subcarriers of the frequency domain of spread spectrum to the DFT zone, and carry out IFFT, be sent to receiver by channel, and in this receiver, carry out FFT and IFFT, thereby extract the channel information of the antenna on the frequency band that is used to send data from r RS of character position.

Can use and the RS sequence mapped directly to frequency domain and need not to carry out DFT with the scheme of carrying out IFFT and be used for the RS sequence being mapped directly to OFDM, SC-FDMA or the scheme of the SC-FDMA symbol area that clusters in the next stage of IFFT at the RS sequence of being shone upon.OFDM, SC-FDMA or the SC-FDMA symbol area that clusters can be the part-time sampling zones of whole OFDM, SC-FDMA or cluster SC-FDMA symbol area or OFDM, SC-FDMA or the SC-FDMA symbol area that clusters.Be inserted under OFDM, SC-FDMA that is used to send data or the situation that clusters the SC-FDMA symbol at RS, can specify OFDM, SC-FDMA or the SC-FDMA symbol that clusters in the fixed position, and RS can be inserted into this fixed position or RS and can be inserted into the position that is generated by Resource Block index and/or sub-district ID according to ad hoc rules.Under the situation of the expense of having added additional RS, it seems that from data and multiplexing visual angle the punching that is used for sending the symbol of data or rate-matched can be guaranteed the resource that RS will be mapped.

UL RS design is not only applicable to UL SU-MIMO scheme and also is applicable to the non-space multiplexing scheme.Under the situation of DM-RS, existing DM-RS to send under the situation of OFDM, SC-FDMA or the SC-FDMA symbol that clusters, can in different OFDM, SC-FDMA or the SC-FDMA symbol that clusters, limit the UL-RS design extraly based on traditional TDM-CDM design.Alternatively, the UL-RS design can be used for replacing specifying based on DM-RS transmission OFDM, the SC-FDMA of traditional TDM-CDM design or the scheme of the SC-FDMA symbol that clusters.UL RS design is not only applicable to DM-RS and also is applicable to SRS.

If OFDM, SC-FDMA or the SC-FDMA symbol that clusters are applied to UL and send, then can limit the pattern that RS is inserted into the fixed frequency carrier position in the Resource Block in the Resource Block unit.This pattern can be limited in the mode that is exclusively used in the sub-district by specific function or the rule of utilizing sub-district ID as input signal.This Resource Block comprise virtual resource blocks and Physical Resource Block the two.Therefore, insert RS in the time of can before the IFFT of transmitter input, carrying out sign map.If being inserted into, RS is used for sending one or more OFDM, the SC-FDMA of data or the SC-FDMA symbol that clusters, then the RS position that can be inserted into the fixed position or generate by Resource Block index and/or sub-district ID according to ad hoc rules.At this moment, can utilize the punching that is used for sending data or carries out the symbol of rate-matched to guarantee the resource that RS will be mapped.

In specific system, for p-q RS among p the RS, use with traditional environment based on the different RS delivery plan of the CAZAC RS delivery plan of TDM in, for specific purpose, can consider based on each transmitting antenna or send the scheme of transmission RS of layer or the scheme of allocation index.Tx antenna/layer structure can change according to UE.For example, under the situation of 2 Tx antenna configurations or 2 layers of transmission, can be basic given antenna port index or layer port index #i and # (i+1) (i 〉=0) with each transmitting antenna or transmission layer.As another example, under the situation of 4 Tx antenna configurations or 4 layers of transmission, can be basic given antenna port index or layer port index #i, # (i+1), # (i+2) and # (i+3) with each transmitting antenna or transmission layer.At this moment, a kind of scheme has been proposed, this scheme will be applied to based on the CAZAC RS of TDM from hanging down q the antenna port that the antenna port index begins in the ascending order mode with excellent relatively channel estimating performance, utilize and said method diverse ways formation sequence, and the RS that will map to physical resource is applied to remaining antenna port.

Except the content of UL grant channel,, should serve as that the basis generates and use SRS with each antenna port or layer port according to UL Tx antenna/layer structure even in the SRS design.At this moment, for the multiplexing capacity of expansion is provided, can and limit transmission cycle of the SRS of each antenna port in the time domain adjustment.In one embodiment of the invention, in the sequences Design environment identical, identical multiplexing capacity is provided to the condition of p transmitting antenna or transmission layer with the SRS of individual antenna, the transmission cycle of the SRS of the time domain of particular UE equates, and the method that can use each antenna or layer order according to UE to send SRS.Alternatively or side by side, can search for the SRS sign indicating number that (distributed comb) scheme designs the capacity that is used to provide expansion explicitly with frequency domain distribution, to support the multiplexing capacity of CDM/FDM efficiently.Specifically, consider cyclic shift u that application code sequence level not only can be used also the sequence under the state of application sequence rank scrambling low associated root index v partly or entirely, a sign indicating number sequence resource can increase v doubly.At this moment, the part of low associated root index can be indicated and (if UL DM-RS is grouped) the interior corresponding index of basic sequence that divide into groups.Low relevant root index is sent to UE by L1/L2 control signaling or higher level RRC signaling.

If utilize the distribution search plan to be mapped in the constant offset interval, then can adjust the search deviant according to channel condition, SRS transmission load or required time of channel detection as the subcarrier of the mapped physical resource of sequence key element.Alternatively or side by side, for the whole system bandwidth of having shone upon SU-MIMO (for example, 20MHz) (for example specify limited frequency band of detection, 5MHz), in this limited frequency band, carry out and survey and packet scheduling, and division and use are at the virtual subnet band system band of a plurality of UL SU-MIMO schemes, thereby the multiplexing capacity in the support frequency domain.The deviant of distribution search plan or frequency band of detection are sent to UE by L1 (ground floor)/L2 (second layer) control signaling or higher level RRC signaling.

(3) structure of the MCS instruction content of n code word

With distribute s bit with MCS of application in the state of specifying single or multiple HARQ processing for n code word and to send the method for this MCS from the base station to UE different, can use the error-detecting ability of considering n code word, the channel estimation ability of each antenna and optimum pre-coding matrix indication (PMI) computing mode that receives the base station are distributed s*n bit and can be sent the method for each code word MCS by the UL grant channel under the situation that need not to compress, and by to s bit of the MCS value of representing the benchmark code word and represent s in the remaining n-1 code word and the individual bit of (s-δ) * (n-1) of the difference between the δ is sued for peace and distributed the method for the individual bit of whole s+ (s-δ) * (n-1).Selection specifies the method for MCS to have nothing to do with selecting HARQ processing indicating means according to code word.That is to say that during single HARQ handled, single ACK/NACK information feedback method was applied to MCW SU-MIMO and sends, and is used for specifying the control information of MCS to be sent to UE by UL permission PDCCH with aspect according to code word.

Each side of the present invention be applicable to from the direct transmission of UE to eNB and during having realized the state that relaying sends from UE to via node, between the via node and transmission from via node to eNB, and control signaling.

Figure 11 illustrates can carry out the present invention and be applicable to subscriber equipment (UE) and the block diagram of the structure of the device of base station (BS).As shown in figure 11, device 110 comprises processing unit 111, memory cell 112, radio frequency (RF) unit 113, display unit 114 and user interface section 115.Processing unit 111 is carried out the processing of physical interface protocol layer.Processing unit 111 provides control plane and user plane.Can be by the processing of processing unit 111 execution for each layer.Memory cell 112 is electrically connected to processing unit 111 and storage operating system, application program and ordinary file.If installing 110 is subscriber equipmenies, then display unit 114 can show various information, and is utilized LCD (LCD) or Organic Light Emitting Diode (OLED) is realized.User interface section 115 can combine with the known user interface such as keyboard, touch-screen etc.RF unit 113 is electrically connected to processing unit 111, to send or to receive the RF signal.

Above-mentioned execution mode of the present invention is disclosed based on the data communications context between base station and the travelling carriage.In this case, the base station is used as the terminal node of network, and the base station can be via this network and travelling carriage direct communication.If necessary, can also carry out the concrete operations undertaken by the base station among the present invention by the nodes higher of base station.

In other words, it will be apparent to those skilled in the art that and to carry out in the network of forming by a plurality of network nodes that comprise this base station realizing the various operations of communicating by letter of base station and travelling carriage by base station or other network node except that the base station.If necessary, term " base station " can be replaced by fixed station, Node-B, eNode-B (eNB) or access point.If necessary, term " travelling carriage " can be replaced by subscriber equipment (UE), travelling carriage (MS) or mobile subscriber station (MSS).

Can utilize various devices (for example, hardware, firmware, software or their combination) to realize embodiments of the present invention.

Utilize hardware to realize under the situation of the present invention, can utilize application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor to wait and realize the present invention.

If utilize firmware or software to realize operation of the present invention or function, then can realize the present invention with various forms (for example, module, process, function etc.).Software code can be stored in the memory cell and by processor and drive.Memory cell is positioned at the inside or the outside of processor, and can come to communicate with above-mentioned processor via various known parts.

Realize above-mentioned execution mode by making up structural element of the present invention and feature in a predefined manner.Unless spell out, otherwise think that each structural element or feature are optionally.Need not to combine, can realize each structural element or feature with other structural element or feature.And, some element and/or feature can be combined each other and construct embodiments of the present invention.Can change the operating sequence described in the embodiment of the present invention.Some structural elements of a kind of execution mode or feature can comprise in other embodiments and can be replaced by the corresponding structure key element or the feature of other execution mode.

In addition, clearly, quote some claims that specific rights requires and can combine with other claim of quoting other claim of this specific rights outside requiring and constitute execution mode, perhaps can after submit applications, add new claim by revising.

The present invention is applicable to other device of subscriber equipment, base station or mobile radio system.

Send if be applied to up link, then can reduce system complexity and improve the flexibility of system management based on single user's multiple-input and multiple-output (SU-MIMO) of many code words (MCW).

It will be apparent to those skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change the present invention.Therefore, the present invention wishes to cover modification of the present invention and the modification within the scope that drops on claims and equivalent thereof.

Claims (9)

1. one kind in the method that is used for generating the up link reference signal in up link sends single user's multiple-input and multiple-output (SU-MIMO) system of one or more code word, and described method comprises the steps:

The place sends the reference signal tectonic information by up link permission physical downlink control channel (PDCCH) to subscriber equipment in the base station, the structure of the reference signal that this reference signal tectonic information indication will send in up link, wherein, described subscriber equipment is set to according to operating with the corresponding up link access module of described information; And

Receive the subframe that comprises the reference signal that is generated based on described reference signal tectonic information from described subscriber equipment,

Wherein, described reference signal tectonic information comprises the cyclic shift value of the sequence of described reference signal.

2. method according to claim 1, wherein, described reference signal tectonic information comprise with whole M the reference signals that will in up link, send in the relevant information of cyclic shift of N reference signal, the offset information that wherein N≤M, and described information comprises the cyclic shift index of a reference signal that is used as standard in the described N reference signal and is used for determining the cyclic shift index of N-1 reference signal of residue.

3. method according to claim 1, wherein, described reference signal tectonic information comprises the cyclic shift index of N reference signal in whole M the reference signals that will send, wherein N≤M in up link.

4. according to claim 2 or 3 described methods, wherein, a described N reference signal is constant amplitude zero auto-correlation (CAZAC) reference signal.

5. according to claim 2 or 3 described methods, wherein, described N reference signal in the described M reference signal is inserted into the predetermined symbol position of time domain, and carries out discrete Fourier transform (DFT) and handle.

6. according to claim 2 or 3 described methods, wherein, described N reference signal in the described M reference signal mapped directly at the input end of inverse discrete Fourier transform (IDFT) or inverse fast Fourier transform (IFFT) and the frequency of distribution and sent the corresponding sampled point of frequency band.

7. method according to claim 1 wherein, is determined numerical value M according to the transmission number of plies of the physics number of transmit antennas that disposes in the described subscriber equipment, virtual transmit antennas number or subframe.

8. one kind is being used for sending the method for distributing the automatic repeat requests indicator channel of physical mixed (PHICH) in single user's multiple-input and multiple-output (SU-MIMO) system of one or more code word in up link, the automatic repeat requests indicator channel of described physical mixed is used for sending the ack/nack (ACK/NACK) at each code word that is sent out, and this method comprises the steps:

Determine the PHICH packet count; And

Utilize described PHICH packet count to determine PHICH packet index and the interior orthogonal sequence index of this PHICH grouping,

Maximum code number of words when wherein, utilizing up link to send is determined described PHICH packet count.

9. method according to claim 8 wherein, is used to provide the function of unique deviant of each code word to determine described orthogonal sequence index in described PHICH packet index and the described PHICH grouping.

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